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Most people say 30-35 gallons is the minimum. An adult bimac can have a body slightly under 5 inches, and arms to almost 14 inches, so you might be more comfortable with a slightly larger tank, if you want a feeling of spaciousness.
I'll be honest. I set up a 30 gallon for my bimac because I was on a cash limit and now that she's in there and I see how much they do explore, I'll set up at least a 55 before I buy another one.
I have Tralfaz in a 55 gal tank and he has explored every inch of it. In fact, he seems to have set up 3 or 4 different little burrows. Can make him quite difficult to find
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